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binoculars Dictionary Terms
Porro prism erecting system
The arrangement of two Porro prisms so that the inverted image formed by certain types of optical instruments is the same as the object. The first prism, which is set at 90° to the second, inverts the image from top to bottom, while the second prism...
relative brightness
A figure of merit corresponding to the amount of light seen by a viewer through binoculars. A higher number indicates a...
infrared binoculars
An instrument, similar in design to regular binoculars, that can transmit and enlarge infrared images.
stereoscopic rangefinder
A rangefinder similar to a pair of binoculars with a long base, a dot or other wander mark provided in each eyepiece field,...
field of view
The field of view (FOV) refers to the extent of the observable world or the visible area that can be seen at any given...
binocular
Designating any instrument in which both eyes can be used to view the image to achieve a stereoscopic effect, or merely to...
eyepiece
Also known as ocular. The lens system used between the final real image in a visual optical system and eye. It acts as an...
prism
A prism is a geometric optical element with flat, polished surfaces that refract light. It is typically a solid, transparent...
prism binoculars
A pair of telescopes with prismatically erected images, mounted side by side with the eyepieces at the interocular distance...
(9 results found)
May 2024
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